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Finding the Fourth Proportional to 784.80, 1,176.40 and 437.60

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Solution

The fourth proportional to 784.80, 1,176.40 and 437.60 is: 655.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.80 : 1,176.40 = 437.60 : x
  2. Step 2: Convert to fraction form
    784.80/1,176.40 = 437.60/x
  3. Step 3: Cross multiply
    784.80x = 1,176.40 × 437.60
  4. Step 4: Simplify right side
    784.80x = 514,792.64
  5. Step 5: Solve for x
    x = 514,792.64/784.80
  6. Step 6: Final answer
    x = 655.95

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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.