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Finding the Fourth Proportional to 10,915.78, 15,064.08 and 6,439.12

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Solution

The fourth proportional to 10,915.78, 15,064.08 and 6,439.12 is: 8,886.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,915.78 : 15,064.08 = 6,439.12 : x
  2. Step 2: Convert to fraction form
    10,915.78/15,064.08 = 6,439.12/x
  3. Step 3: Cross multiply
    10,915.78x = 15,064.08 × 6,439.12
  4. Step 4: Simplify right side
    10,915.78x = 96,999,418.81
  5. Step 5: Solve for x
    x = 96,999,418.81/10,915.78
  6. Step 6: Final answer
    x = 8,886.16

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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.