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Finding the Fourth Proportional to 1,261.70, 1,892.55 and 913.40

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Solution

The fourth proportional to 1,261.70, 1,892.55 and 913.40 is: 1,370.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.70 : 1,892.55 = 913.40 : x
  2. Step 2: Convert to fraction form
    1,261.70/1,892.55 = 913.40/x
  3. Step 3: Cross multiply
    1,261.70x = 1,892.55 × 913.40
  4. Step 4: Simplify right side
    1,261.70x = 1,728,655.17
  5. Step 5: Solve for x
    x = 1,728,655.17/1,261.70
  6. Step 6: Final answer
    x = 1,370.10

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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.