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Finding the Fourth Proportional to 8,915.94, 12,295.40 and 7,129.08

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Solution

The fourth proportional to 8,915.94, 12,295.40 and 7,129.08 is: 9,831.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,915.94 : 12,295.40 = 7,129.08 : x
  2. Step 2: Convert to fraction form
    8,915.94/12,295.40 = 7,129.08/x
  3. Step 3: Cross multiply
    8,915.94x = 12,295.40 × 7,129.08
  4. Step 4: Simplify right side
    8,915.94x = 87,654,854.59
  5. Step 5: Solve for x
    x = 87,654,854.59/8,915.94
  6. Step 6: Final answer
    x = 9,831.25

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.