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Finding the Fourth Proportional to 653.66, 980.80 and 288.40

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Solution

The fourth proportional to 653.66, 980.80 and 288.40 is: 432.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    653.66 : 980.80 = 288.40 : x
  2. Step 2: Convert to fraction form
    653.66/980.80 = 288.40/x
  3. Step 3: Cross multiply
    653.66x = 980.80 × 288.40
  4. Step 4: Simplify right side
    653.66x = 282,862.72
  5. Step 5: Solve for x
    x = 282,862.72/653.66
  6. Step 6: Final answer
    x = 432.74

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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.