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Finding the Fourth Proportional to 1,130.60, 1,561.11 and 910.59

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Solution

The fourth proportional to 1,130.60, 1,561.11 and 910.59 is: 1,257.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,130.60 : 1,561.11 = 910.59 : x
  2. Step 2: Convert to fraction form
    1,130.60/1,561.11 = 910.59/x
  3. Step 3: Cross multiply
    1,130.60x = 1,561.11 × 910.59
  4. Step 4: Simplify right side
    1,130.60x = 1,421,521.89
  5. Step 5: Solve for x
    x = 1,421,521.89/1,130.60
  6. Step 6: Final answer
    x = 1,257.31

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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.