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Finding the Fourth Proportional to 84,895.80, 127,343.70 and 42,905.40

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Solution

The fourth proportional to 84,895.80, 127,343.70 and 42,905.40 is: 64,358.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,895.80 : 127,343.70 = 42,905.40 : x
  2. Step 2: Convert to fraction form
    84,895.80/127,343.70 = 42,905.40/x
  3. Step 3: Cross multiply
    84,895.80x = 127,343.70 × 42,905.40
  4. Step 4: Simplify right side
    84,895.80x = 5,463,732,385.98
  5. Step 5: Solve for x
    x = 5,463,732,385.98/84,895.80
  6. Step 6: Final answer
    x = 64,358.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.