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Finding the Fourth Proportional to 1,089.56, 1,503.90 and 740.25

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Solution

The fourth proportional to 1,089.56, 1,503.90 and 740.25 is: 1,021.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,089.56 : 1,503.90 = 740.25 : x
  2. Step 2: Convert to fraction form
    1,089.56/1,503.90 = 740.25/x
  3. Step 3: Cross multiply
    1,089.56x = 1,503.90 × 740.25
  4. Step 4: Simplify right side
    1,089.56x = 1,113,261.98
  5. Step 5: Solve for x
    x = 1,113,261.98/1,089.56
  6. Step 6: Final answer
    x = 1,021.75

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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.