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Finding the Fourth Proportional to 760.50, 1,139.58 and 500.28

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Solution

The fourth proportional to 760.50, 1,139.58 and 500.28 is: 749.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    760.50 : 1,139.58 = 500.28 : x
  2. Step 2: Convert to fraction form
    760.50/1,139.58 = 500.28/x
  3. Step 3: Cross multiply
    760.50x = 1,139.58 × 500.28
  4. Step 4: Simplify right side
    760.50x = 570,109.08
  5. Step 5: Solve for x
    x = 570,109.08/760.50
  6. Step 6: Final answer
    x = 749.65

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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.