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Finding the Fourth Proportional to 85,833.70, 128,491.35 and 75,465.70

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Solution

The fourth proportional to 85,833.70, 128,491.35 and 75,465.70 is: 112,970.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,833.70 : 128,491.35 = 75,465.70 : x
  2. Step 2: Convert to fraction form
    85,833.70/128,491.35 = 75,465.70/x
  3. Step 3: Cross multiply
    85,833.70x = 128,491.35 × 75,465.70
  4. Step 4: Simplify right side
    85,833.70x = 9,696,689,671.70
  5. Step 5: Solve for x
    x = 9,696,689,671.70/85,833.70
  6. Step 6: Final answer
    x = 112,970.66

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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.