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Finding the Fourth Proportional to 28,416.60, 42,616.80 and 8,690.40

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Solution

The fourth proportional to 28,416.60, 42,616.80 and 8,690.40 is: 13,033.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,416.60 : 42,616.80 = 8,690.40 : x
  2. Step 2: Convert to fraction form
    28,416.60/42,616.80 = 8,690.40/x
  3. Step 3: Cross multiply
    28,416.60x = 42,616.80 × 8,690.40
  4. Step 4: Simplify right side
    28,416.60x = 370,357,038.72
  5. Step 5: Solve for x
    x = 370,357,038.72/28,416.60
  6. Step 6: Final answer
    x = 13,033.12

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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.