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Finding the Fourth Proportional to 10,347.62, 15,535.20 and 5,421.20

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Solution

The fourth proportional to 10,347.62, 15,535.20 and 5,421.20 is: 8,139.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,347.62 : 15,535.20 = 5,421.20 : x
  2. Step 2: Convert to fraction form
    10,347.62/15,535.20 = 5,421.20/x
  3. Step 3: Cross multiply
    10,347.62x = 15,535.20 × 5,421.20
  4. Step 4: Simplify right side
    10,347.62x = 84,219,426.24
  5. Step 5: Solve for x
    x = 84,219,426.24/10,347.62
  6. Step 6: Final answer
    x = 8,139.01

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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.