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Finding the Fourth Proportional to 85,674.40, 128,473.20 and 38,903.20

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Solution

The fourth proportional to 85,674.40, 128,473.20 and 38,903.20 is: 58,337.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,674.40 : 128,473.20 = 38,903.20 : x
  2. Step 2: Convert to fraction form
    85,674.40/128,473.20 = 38,903.20/x
  3. Step 3: Cross multiply
    85,674.40x = 128,473.20 × 38,903.20
  4. Step 4: Simplify right side
    85,674.40x = 4,998,018,594.24
  5. Step 5: Solve for x
    x = 4,998,018,594.24/85,674.40
  6. Step 6: Final answer
    x = 58,337.36

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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.