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Finding the Fourth Proportional to 99,690.78, 137,565.63 and 57,262.98

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Solution

The fourth proportional to 99,690.78, 137,565.63 and 57,262.98 is: 79,018.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,690.78 : 137,565.63 = 57,262.98 : x
  2. Step 2: Convert to fraction form
    99,690.78/137,565.63 = 57,262.98/x
  3. Step 3: Cross multiply
    99,690.78x = 137,565.63 × 57,262.98
  4. Step 4: Simplify right side
    99,690.78x = 7,877,417,919.38
  5. Step 5: Solve for x
    x = 7,877,417,919.38/99,690.78
  6. Step 6: Final answer
    x = 79,018.52

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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.