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Finding the Fourth Proportional to 1,247,643.71, 1,721,748.42 and 674,683.88

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Solution

The fourth proportional to 1,247,643.71, 1,721,748.42 and 674,683.88 is: 931,063.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,247,643.71 : 1,721,748.42 = 674,683.88 : x
  2. Step 2: Convert to fraction form
    1,247,643.71/1,721,748.42 = 674,683.88/x
  3. Step 3: Cross multiply
    1,247,643.71x = 1,721,748.42 × 674,683.88
  4. Step 4: Simplify right side
    1,247,643.71x = 1,161,635,904,389.47
  5. Step 5: Solve for x
    x = 1,161,635,904,389.47/1,247,643.71
  6. Step 6: Final answer
    x = 931,063.81

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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.