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Finding the Fourth Proportional to 10,420.03, 15,602.10 and 7,139.53

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Solution

The fourth proportional to 10,420.03, 15,602.10 and 7,139.53 is: 10,690.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,420.03 : 15,602.10 = 7,139.53 : x
  2. Step 2: Convert to fraction form
    10,420.03/15,602.10 = 7,139.53/x
  3. Step 3: Cross multiply
    10,420.03x = 15,602.10 × 7,139.53
  4. Step 4: Simplify right side
    10,420.03x = 111,391,661.01
  5. Step 5: Solve for x
    x = 111,391,661.01/10,420.03
  6. Step 6: Final answer
    x = 10,690.15

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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.