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Finding the Fourth Proportional to 85,572.78, 128,359.53 and 56,176.62

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Solution

The fourth proportional to 85,572.78, 128,359.53 and 56,176.62 is: 84,265.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,572.78 : 128,359.53 = 56,176.62 : x
  2. Step 2: Convert to fraction form
    85,572.78/128,359.53 = 56,176.62/x
  3. Step 3: Cross multiply
    85,572.78x = 128,359.53 × 56,176.62
  4. Step 4: Simplify right side
    85,572.78x = 7,210,804,540.19
  5. Step 5: Solve for x
    x = 7,210,804,540.19/85,572.78
  6. Step 6: Final answer
    x = 84,265.17

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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.