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Finding the Fourth Proportional to 10,266.40, 15,421.20 and 9,899.20

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Solution

The fourth proportional to 10,266.40, 15,421.20 and 9,899.20 is: 14,869.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,266.40 : 15,421.20 = 9,899.20 : x
  2. Step 2: Convert to fraction form
    10,266.40/15,421.20 = 9,899.20/x
  3. Step 3: Cross multiply
    10,266.40x = 15,421.20 × 9,899.20
  4. Step 4: Simplify right side
    10,266.40x = 152,657,543.04
  5. Step 5: Solve for x
    x = 152,657,543.04/10,266.40
  6. Step 6: Final answer
    x = 14,869.63

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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.