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Finding the Fourth Proportional to 912, 1,259.12 and 715.04

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Solution

The fourth proportional to 912, 1,259.12 and 715.04 is: 987.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    912 : 1,259.12 = 715.04 : x
  2. Step 2: Convert to fraction form
    912/1,259.12 = 715.04/x
  3. Step 3: Cross multiply
    912x = 1,259.12 × 715.04
  4. Step 4: Simplify right side
    912x = 900,321.16
  5. Step 5: Solve for x
    x = 900,321.16/912
  6. Step 6: Final answer
    x = 987.19

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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.