Home / 1,089.40-1,503.42-669.77

Finding the Fourth Proportional to 1,089.40, 1,503.42 and 669.77

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Solution

The fourth proportional to 1,089.40, 1,503.42 and 669.77 is: 924.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,089.40 : 1,503.42 = 669.77 : x
  2. Step 2: Convert to fraction form
    1,089.40/1,503.42 = 669.77/x
  3. Step 3: Cross multiply
    1,089.40x = 1,503.42 × 669.77
  4. Step 4: Simplify right side
    1,089.40x = 1,006,945.61
  5. Step 5: Solve for x
    x = 1,006,945.61/1,089.40
  6. Step 6: Final answer
    x = 924.32

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1.5x scale

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.