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Finding the Fourth Proportional to 74,139.78, 102,312.90 and 40,605.78

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Solution

The fourth proportional to 74,139.78, 102,312.90 and 40,605.78 is: 56,035.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,139.78 : 102,312.90 = 40,605.78 : x
  2. Step 2: Convert to fraction form
    74,139.78/102,312.90 = 40,605.78/x
  3. Step 3: Cross multiply
    74,139.78x = 102,312.90 × 40,605.78
  4. Step 4: Simplify right side
    74,139.78x = 4,154,495,108.56
  5. Step 5: Solve for x
    x = 4,154,495,108.56/74,139.78
  6. Step 6: Final answer
    x = 56,035.98

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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.