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Finding the Fourth Proportional to 1,354,836.72, 1,869,672.48 and 781,876.80

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Solution

The fourth proportional to 1,354,836.72, 1,869,672.48 and 781,876.80 is: 1,078,988.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,354,836.72 : 1,869,672.48 = 781,876.80 : x
  2. Step 2: Convert to fraction form
    1,354,836.72/1,869,672.48 = 781,876.80/x
  3. Step 3: Cross multiply
    1,354,836.72x = 1,869,672.48 × 781,876.80
  4. Step 4: Simplify right side
    1,354,836.72x = 1,461,853,535,710.46
  5. Step 5: Solve for x
    x = 1,461,853,535,710.46/1,354,836.72
  6. Step 6: Final answer
    x = 1,078,988.72

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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.