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Finding the Fourth Proportional to 1,270.40, 1,753.21 and 710.87

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Solution

The fourth proportional to 1,270.40, 1,753.21 and 710.87 is: 981.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,270.40 : 1,753.21 = 710.87 : x
  2. Step 2: Convert to fraction form
    1,270.40/1,753.21 = 710.87/x
  3. Step 3: Cross multiply
    1,270.40x = 1,753.21 × 710.87
  4. Step 4: Simplify right side
    1,270.40x = 1,246,295.63
  5. Step 5: Solve for x
    x = 1,246,295.63/1,270.40
  6. Step 6: Final answer
    x = 981.03

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.