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Finding the Fourth Proportional to 1,526.40, 2,120.40 and 1,472.40

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Solution

The fourth proportional to 1,526.40, 2,120.40 and 1,472.40 is: 2,045.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,526.40 : 2,120.40 = 1,472.40 : x
  2. Step 2: Convert to fraction form
    1,526.40/2,120.40 = 1,472.40/x
  3. Step 3: Cross multiply
    1,526.40x = 2,120.40 × 1,472.40
  4. Step 4: Simplify right side
    1,526.40x = 3,122,076.96
  5. Step 5: Solve for x
    x = 3,122,076.96/1,526.40
  6. Step 6: Final answer
    x = 2,045.39

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.