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Finding the Fourth Proportional to 760.96, 1,140.21 and 688.06

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Solution

The fourth proportional to 760.96, 1,140.21 and 688.06 is: 1,030.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    760.96 : 1,140.21 = 688.06 : x
  2. Step 2: Convert to fraction form
    760.96/1,140.21 = 688.06/x
  3. Step 3: Cross multiply
    760.96x = 1,140.21 × 688.06
  4. Step 4: Simplify right side
    760.96x = 784,532.89
  5. Step 5: Solve for x
    x = 784,532.89/760.96
  6. Step 6: Final answer
    x = 1,030.98

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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.