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Finding the Fourth Proportional to 1,405.70, 2,108.55 and 625.70

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Solution

The fourth proportional to 1,405.70, 2,108.55 and 625.70 is: 938.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,405.70 : 2,108.55 = 625.70 : x
  2. Step 2: Convert to fraction form
    1,405.70/2,108.55 = 625.70/x
  3. Step 3: Cross multiply
    1,405.70x = 2,108.55 × 625.70
  4. Step 4: Simplify right side
    1,405.70x = 1,319,319.74
  5. Step 5: Solve for x
    x = 1,319,319.74/1,405.70
  6. Step 6: Final answer
    x = 938.55

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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.