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Finding the Fourth Proportional to 28,612.32, 42,916.60 and 9,888

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Solution

The fourth proportional to 28,612.32, 42,916.60 and 9,888 is: 14,831.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,612.32 : 42,916.60 = 9,888 : x
  2. Step 2: Convert to fraction form
    28,612.32/42,916.60 = 9,888/x
  3. Step 3: Cross multiply
    28,612.32x = 42,916.60 × 9,888
  4. Step 4: Simplify right side
    28,612.32x = 424,359,340.80
  5. Step 5: Solve for x
    x = 424,359,340.80/28,612.32
  6. Step 6: Final answer
    x = 14,831.35

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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.