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Finding the Fourth Proportional to 8,585.40, 12,865.95 and 5,288.70

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Solution

The fourth proportional to 8,585.40, 12,865.95 and 5,288.70 is: 7,925.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,585.40 : 12,865.95 = 5,288.70 : x
  2. Step 2: Convert to fraction form
    8,585.40/12,865.95 = 5,288.70/x
  3. Step 3: Cross multiply
    8,585.40x = 12,865.95 × 5,288.70
  4. Step 4: Simplify right side
    8,585.40x = 68,044,149.77
  5. Step 5: Solve for x
    x = 68,044,149.77/8,585.40
  6. Step 6: Final answer
    x = 7,925.57

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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.