Home / 1,130.40-1,686.60-1,123.20

Finding the Fourth Proportional to 1,130.40, 1,686.60 and 1,123.20

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Solution

The fourth proportional to 1,130.40, 1,686.60 and 1,123.20 is: 1,675.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,130.40 : 1,686.60 = 1,123.20 : x
  2. Step 2: Convert to fraction form
    1,130.40/1,686.60 = 1,123.20/x
  3. Step 3: Cross multiply
    1,130.40x = 1,686.60 × 1,123.20
  4. Step 4: Simplify right side
    1,130.40x = 1,894,389.12
  5. Step 5: Solve for x
    x = 1,894,389.12/1,130.40
  6. Step 6: Final answer
    x = 1,675.86

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.