Home / 1,129.04-1,557.72-631.61

Finding the Fourth Proportional to 1,129.04, 1,557.72 and 631.61

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Solution

The fourth proportional to 1,129.04, 1,557.72 and 631.61 is: 871.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.04 : 1,557.72 = 631.61 : x
  2. Step 2: Convert to fraction form
    1,129.04/1,557.72 = 631.61/x
  3. Step 3: Cross multiply
    1,129.04x = 1,557.72 × 631.61
  4. Step 4: Simplify right side
    1,129.04x = 983,871.53
  5. Step 5: Solve for x
    x = 983,871.53/1,129.04
  6. Step 6: Final answer
    x = 871.42

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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.