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Finding the Fourth Proportional to 1,036.32, 1,430.16 and 616.80

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Solution

The fourth proportional to 1,036.32, 1,430.16 and 616.80 is: 851.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,036.32 : 1,430.16 = 616.80 : x
  2. Step 2: Convert to fraction form
    1,036.32/1,430.16 = 616.80/x
  3. Step 3: Cross multiply
    1,036.32x = 1,430.16 × 616.80
  4. Step 4: Simplify right side
    1,036.32x = 882,122.69
  5. Step 5: Solve for x
    x = 882,122.69/1,036.32
  6. Step 6: Final answer
    x = 851.21

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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.