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Finding the Fourth Proportional to 1,288,643.10, 1,932,964.65 and 815,862.30

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Solution

The fourth proportional to 1,288,643.10, 1,932,964.65 and 815,862.30 is: 1,223,793.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,288,643.10 : 1,932,964.65 = 815,862.30 : x
  2. Step 2: Convert to fraction form
    1,288,643.10/1,932,964.65 = 815,862.30/x
  3. Step 3: Cross multiply
    1,288,643.10x = 1,932,964.65 × 815,862.30
  4. Step 4: Simplify right side
    1,288,643.10x = 1,577,032,985,167.70
  5. Step 5: Solve for x
    x = 1,577,032,985,167.70/1,288,643.10
  6. Step 6: Final answer
    x = 1,223,793.45

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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.