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Finding the Fourth Proportional to 672,656.55, 928,288.40 and 400,687.31

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Solution

The fourth proportional to 672,656.55, 928,288.40 and 400,687.31 is: 552,961.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    672,656.55 : 928,288.40 = 400,687.31 : x
  2. Step 2: Convert to fraction form
    672,656.55/928,288.40 = 400,687.31/x
  3. Step 3: Cross multiply
    672,656.55x = 928,288.40 × 400,687.31
  4. Step 4: Simplify right side
    672,656.55x = 371,953,380,581.20
  5. Step 5: Solve for x
    x = 371,953,380,581.20/672,656.55
  6. Step 6: Final answer
    x = 552,961.80

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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.