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Finding the Fourth Proportional to 763.72, 1,145.76 and 417.40

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Solution

The fourth proportional to 763.72, 1,145.76 and 417.40 is: 626.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.72 : 1,145.76 = 417.40 : x
  2. Step 2: Convert to fraction form
    763.72/1,145.76 = 417.40/x
  3. Step 3: Cross multiply
    763.72x = 1,145.76 × 417.40
  4. Step 4: Simplify right side
    763.72x = 478,240.22
  5. Step 5: Solve for x
    x = 478,240.22/763.72
  6. Step 6: Final answer
    x = 626.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.