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Finding the Fourth Proportional to 786.61, 1,178.70 and 580.20

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Solution

The fourth proportional to 786.61, 1,178.70 and 580.20 is: 869.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.61 : 1,178.70 = 580.20 : x
  2. Step 2: Convert to fraction form
    786.61/1,178.70 = 580.20/x
  3. Step 3: Cross multiply
    786.61x = 1,178.70 × 580.20
  4. Step 4: Simplify right side
    786.61x = 683,881.74
  5. Step 5: Solve for x
    x = 683,881.74/786.61
  6. Step 6: Final answer
    x = 869.40

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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.