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Finding the Fourth Proportional to 18,312.88, 25,271.64 and 9,929.32

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Solution

The fourth proportional to 18,312.88, 25,271.64 and 9,929.32 is: 13,702.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,312.88 : 25,271.64 = 9,929.32 : x
  2. Step 2: Convert to fraction form
    18,312.88/25,271.64 = 9,929.32/x
  3. Step 3: Cross multiply
    18,312.88x = 25,271.64 × 9,929.32
  4. Step 4: Simplify right side
    18,312.88x = 250,930,200.48
  5. Step 5: Solve for x
    x = 250,930,200.48/18,312.88
  6. Step 6: Final answer
    x = 13,702.39

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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.