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Finding the Fourth Proportional to 760.65, 1,140.12 and 577.50

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Solution

The fourth proportional to 760.65, 1,140.12 and 577.50 is: 865.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    760.65 : 1,140.12 = 577.50 : x
  2. Step 2: Convert to fraction form
    760.65/1,140.12 = 577.50/x
  3. Step 3: Cross multiply
    760.65x = 1,140.12 × 577.50
  4. Step 4: Simplify right side
    760.65x = 658,419.30
  5. Step 5: Solve for x
    x = 658,419.30/760.65
  6. Step 6: Final answer
    x = 865.60

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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.