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Finding the Fourth Proportional to 1,130.42, 1,560.85 and 910.40

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Solution

The fourth proportional to 1,130.42, 1,560.85 and 910.40 is: 1,257.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,130.42 : 1,560.85 = 910.40 : x
  2. Step 2: Convert to fraction form
    1,130.42/1,560.85 = 910.40/x
  3. Step 3: Cross multiply
    1,130.42x = 1,560.85 × 910.40
  4. Step 4: Simplify right side
    1,130.42x = 1,420,993.61
  5. Step 5: Solve for x
    x = 1,420,993.61/1,130.42
  6. Step 6: Final answer
    x = 1,257.05

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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.