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Finding the Fourth Proportional to 876,864.80, 1,312,672.80 and 782,386.40

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Solution

The fourth proportional to 876,864.80, 1,312,672.80 and 782,386.40 is: 1,171,237.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    876,864.80 : 1,312,672.80 = 782,386.40 : x
  2. Step 2: Convert to fraction form
    876,864.80/1,312,672.80 = 782,386.40/x
  3. Step 3: Cross multiply
    876,864.80x = 1,312,672.80 × 782,386.40
  4. Step 4: Simplify right side
    876,864.80x = 1,027,017,346,369.92
  5. Step 5: Solve for x
    x = 1,027,017,346,369.92/876,864.80
  6. Step 6: Final answer
    x = 1,171,237.97

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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.