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Finding the Fourth Proportional to 989.78, 1,484.55 and 373.56

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Solution

The fourth proportional to 989.78, 1,484.55 and 373.56 is: 560.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.78 : 1,484.55 = 373.56 : x
  2. Step 2: Convert to fraction form
    989.78/1,484.55 = 373.56/x
  3. Step 3: Cross multiply
    989.78x = 1,484.55 × 373.56
  4. Step 4: Simplify right side
    989.78x = 554,568.50
  5. Step 5: Solve for x
    x = 554,568.50/989.78
  6. Step 6: Final answer
    x = 560.30

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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.