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Finding the Fourth Proportional to 760.56, 1,139.36 and 621.92

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Solution

The fourth proportional to 760.56, 1,139.36 and 621.92 is: 931.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    760.56 : 1,139.36 = 621.92 : x
  2. Step 2: Convert to fraction form
    760.56/1,139.36 = 621.92/x
  3. Step 3: Cross multiply
    760.56x = 1,139.36 × 621.92
  4. Step 4: Simplify right side
    760.56x = 708,590.77
  5. Step 5: Solve for x
    x = 708,590.77/760.56
  6. Step 6: Final answer
    x = 931.67

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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.