Home / 1,123.04-1,681.20-904.80

Finding the Fourth Proportional to 1,123.04, 1,681.20 and 904.80

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Solution

The fourth proportional to 1,123.04, 1,681.20 and 904.80 is: 1,354.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,123.04 : 1,681.20 = 904.80 : x
  2. Step 2: Convert to fraction form
    1,123.04/1,681.20 = 904.80/x
  3. Step 3: Cross multiply
    1,123.04x = 1,681.20 × 904.80
  4. Step 4: Simplify right side
    1,123.04x = 1,521,149.76
  5. Step 5: Solve for x
    x = 1,521,149.76/1,123.04
  6. Step 6: Final answer
    x = 1,354.49

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1.5x scale

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.