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Finding the Fourth Proportional to 8,376.80, 12,565.20 and 4,920.80

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Solution

The fourth proportional to 8,376.80, 12,565.20 and 4,920.80 is: 7,381.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,376.80 : 12,565.20 = 4,920.80 : x
  2. Step 2: Convert to fraction form
    8,376.80/12,565.20 = 4,920.80/x
  3. Step 3: Cross multiply
    8,376.80x = 12,565.20 × 4,920.80
  4. Step 4: Simplify right side
    8,376.80x = 61,830,836.16
  5. Step 5: Solve for x
    x = 61,830,836.16/8,376.80
  6. Step 6: Final answer
    x = 7,381.20

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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.