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Finding the Fourth Proportional to 859.19, 1,186.63 and 646.13

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Solution

The fourth proportional to 859.19, 1,186.63 and 646.13 is: 892.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.19 : 1,186.63 = 646.13 : x
  2. Step 2: Convert to fraction form
    859.19/1,186.63 = 646.13/x
  3. Step 3: Cross multiply
    859.19x = 1,186.63 × 646.13
  4. Step 4: Simplify right side
    859.19x = 766,718.59
  5. Step 5: Solve for x
    x = 766,718.59/859.19
  6. Step 6: Final answer
    x = 892.38

Related Problems

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Half scale
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Double scale
Find fourth proportional to 860.19, 1,188.01 and 647.13
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.