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Finding the Fourth Proportional to 559,909.70, 772,642.10 and 318,158.72

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Solution

The fourth proportional to 559,909.70, 772,642.10 and 318,158.72 is: 439,040.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    559,909.70 : 772,642.10 = 318,158.72 : x
  2. Step 2: Convert to fraction form
    559,909.70/772,642.10 = 318,158.72/x
  3. Step 3: Cross multiply
    559,909.70x = 772,642.10 × 318,158.72
  4. Step 4: Simplify right side
    559,909.70x = 245,822,819,963.32
  5. Step 5: Solve for x
    x = 245,822,819,963.32/559,909.70
  6. Step 6: Final answer
    x = 439,040.12

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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.