Home / 1,140.83-1,710.47-921.72

Finding the Fourth Proportional to 1,140.83, 1,710.47 and 921.72

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Solution

The fourth proportional to 1,140.83, 1,710.47 and 921.72 is: 1,381.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,140.83 : 1,710.47 = 921.72 : x
  2. Step 2: Convert to fraction form
    1,140.83/1,710.47 = 921.72/x
  3. Step 3: Cross multiply
    1,140.83x = 1,710.47 × 921.72
  4. Step 4: Simplify right side
    1,140.83x = 1,576,569.80
  5. Step 5: Solve for x
    x = 1,576,569.80/1,140.83
  6. Step 6: Final answer
    x = 1,381.96

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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.