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Finding the Fourth Proportional to 715.03, 987.57 and 478.59

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Solution

The fourth proportional to 715.03, 987.57 and 478.59 is: 661.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.03 : 987.57 = 478.59 : x
  2. Step 2: Convert to fraction form
    715.03/987.57 = 478.59/x
  3. Step 3: Cross multiply
    715.03x = 987.57 × 478.59
  4. Step 4: Simplify right side
    715.03x = 472,641.13
  5. Step 5: Solve for x
    x = 472,641.13/715.03
  6. Step 6: Final answer
    x = 661.01

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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.