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Finding the Fourth Proportional to 611,327.20, 916,990.80 and 471,359.20

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Solution

The fourth proportional to 611,327.20, 916,990.80 and 471,359.20 is: 707,038.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,327.20 : 916,990.80 = 471,359.20 : x
  2. Step 2: Convert to fraction form
    611,327.20/916,990.80 = 471,359.20/x
  3. Step 3: Cross multiply
    611,327.20x = 916,990.80 × 471,359.20
  4. Step 4: Simplify right side
    611,327.20x = 432,232,049,895.36
  5. Step 5: Solve for x
    x = 432,232,049,895.36/611,327.20
  6. Step 6: Final answer
    x = 707,038.80

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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.