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Finding the Fourth Proportional to 707.38, 1,055.17 and 619.90

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Solution

The fourth proportional to 707.38, 1,055.17 and 619.90 is: 924.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    707.38 : 1,055.17 = 619.90 : x
  2. Step 2: Convert to fraction form
    707.38/1,055.17 = 619.90/x
  3. Step 3: Cross multiply
    707.38x = 1,055.17 × 619.90
  4. Step 4: Simplify right side
    707.38x = 654,096.78
  5. Step 5: Solve for x
    x = 654,096.78/707.38
  6. Step 6: Final answer
    x = 924.68

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.