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Finding the Fourth Proportional to 858.04, 1,185.16 and 709.20

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Solution

The fourth proportional to 858.04, 1,185.16 and 709.20 is: 979.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.04 : 1,185.16 = 709.20 : x
  2. Step 2: Convert to fraction form
    858.04/1,185.16 = 709.20/x
  3. Step 3: Cross multiply
    858.04x = 1,185.16 × 709.20
  4. Step 4: Simplify right side
    858.04x = 840,515.47
  5. Step 5: Solve for x
    x = 840,515.47/858.04
  6. Step 6: Final answer
    x = 979.58

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Double scale
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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.