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Finding the Fourth Proportional to 66,981.60, 92,390.40 and 43,070.40

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Solution

The fourth proportional to 66,981.60, 92,390.40 and 43,070.40 is: 59,408.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,981.60 : 92,390.40 = 43,070.40 : x
  2. Step 2: Convert to fraction form
    66,981.60/92,390.40 = 43,070.40/x
  3. Step 3: Cross multiply
    66,981.60x = 92,390.40 × 43,070.40
  4. Step 4: Simplify right side
    66,981.60x = 3,979,291,484.16
  5. Step 5: Solve for x
    x = 3,979,291,484.16/66,981.60
  6. Step 6: Final answer
    x = 59,408.73

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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.