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Finding the Fourth Proportional to 780.04, 1,076.70 and 500.32

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Solution

The fourth proportional to 780.04, 1,076.70 and 500.32 is: 690.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    780.04 : 1,076.70 = 500.32 : x
  2. Step 2: Convert to fraction form
    780.04/1,076.70 = 500.32/x
  3. Step 3: Cross multiply
    780.04x = 1,076.70 × 500.32
  4. Step 4: Simplify right side
    780.04x = 538,694.54
  5. Step 5: Solve for x
    x = 538,694.54/780.04
  6. Step 6: Final answer
    x = 690.60

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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.