Home / 12,888.72-17,780.40-8,915.36

Finding the Fourth Proportional to 12,888.72, 17,780.40 and 8,915.36

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Solution

The fourth proportional to 12,888.72, 17,780.40 and 8,915.36 is: 12,299.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,888.72 : 17,780.40 = 8,915.36 : x
  2. Step 2: Convert to fraction form
    12,888.72/17,780.40 = 8,915.36/x
  3. Step 3: Cross multiply
    12,888.72x = 17,780.40 × 8,915.36
  4. Step 4: Simplify right side
    12,888.72x = 158,518,666.94
  5. Step 5: Solve for x
    x = 158,518,666.94/12,888.72
  6. Step 6: Final answer
    x = 12,299.02

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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.