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Finding the Fourth Proportional to 98,857.78, 136,433.55 and 56,422.72

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Solution

The fourth proportional to 98,857.78, 136,433.55 and 56,422.72 is: 77,868.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,857.78 : 136,433.55 = 56,422.72 : x
  2. Step 2: Convert to fraction form
    98,857.78/136,433.55 = 56,422.72/x
  3. Step 3: Cross multiply
    98,857.78x = 136,433.55 × 56,422.72
  4. Step 4: Simplify right side
    98,857.78x = 7,697,951,990.26
  5. Step 5: Solve for x
    x = 7,697,951,990.26/98,857.78
  6. Step 6: Final answer
    x = 77,868.95

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1.5x scale

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.