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Finding the Fourth Proportional to 2,688.40, 4,032.28 and 740.40

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Solution

The fourth proportional to 2,688.40, 4,032.28 and 740.40 is: 1,110.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,688.40 : 4,032.28 = 740.40 : x
  2. Step 2: Convert to fraction form
    2,688.40/4,032.28 = 740.40/x
  3. Step 3: Cross multiply
    2,688.40x = 4,032.28 × 740.40
  4. Step 4: Simplify right side
    2,688.40x = 2,985,500.11
  5. Step 5: Solve for x
    x = 2,985,500.11/2,688.40
  6. Step 6: Final answer
    x = 1,110.51

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1.5x scale

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.