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Finding the Fourth Proportional to 740.40, 1,110.60 and 554.10

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Solution

The fourth proportional to 740.40, 1,110.60 and 554.10 is: 831.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.40 : 1,110.60 = 554.10 : x
  2. Step 2: Convert to fraction form
    740.40/1,110.60 = 554.10/x
  3. Step 3: Cross multiply
    740.40x = 1,110.60 × 554.10
  4. Step 4: Simplify right side
    740.40x = 615,383.46
  5. Step 5: Solve for x
    x = 615,383.46/740.40
  6. Step 6: Final answer
    x = 831.15

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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.