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Finding the Fourth Proportional to 860.40, 1,186.65 and 510.75

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Solution

The fourth proportional to 860.40, 1,186.65 and 510.75 is: 704.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.40 : 1,186.65 = 510.75 : x
  2. Step 2: Convert to fraction form
    860.40/1,186.65 = 510.75/x
  3. Step 3: Cross multiply
    860.40x = 1,186.65 × 510.75
  4. Step 4: Simplify right side
    860.40x = 606,081.49
  5. Step 5: Solve for x
    x = 606,081.49/860.40
  6. Step 6: Final answer
    x = 704.42

Related Problems

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Half scale
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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.