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Finding the Fourth Proportional to 85,802.20, 128,444.10 and 75,434.20

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Solution

The fourth proportional to 85,802.20, 128,444.10 and 75,434.20 is: 112,923.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,802.20 : 128,444.10 = 75,434.20 : x
  2. Step 2: Convert to fraction form
    85,802.20/128,444.10 = 75,434.20/x
  3. Step 3: Cross multiply
    85,802.20x = 128,444.10 × 75,434.20
  4. Step 4: Simplify right side
    85,802.20x = 9,689,077,928.22
  5. Step 5: Solve for x
    x = 9,689,077,928.22/85,802.20
  6. Step 6: Final answer
    x = 112,923.42

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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.