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Finding the Fourth Proportional to 704.60, 1,056.90 and 653.40

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Solution

The fourth proportional to 704.60, 1,056.90 and 653.40 is: 980.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    704.60 : 1,056.90 = 653.40 : x
  2. Step 2: Convert to fraction form
    704.60/1,056.90 = 653.40/x
  3. Step 3: Cross multiply
    704.60x = 1,056.90 × 653.40
  4. Step 4: Simplify right side
    704.60x = 690,578.46
  5. Step 5: Solve for x
    x = 690,578.46/704.60
  6. Step 6: Final answer
    x = 980.10

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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.