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Finding the Fourth Proportional to 830.79, 1,247.00 and 624.65

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Solution

The fourth proportional to 830.79, 1,247.00 and 624.65 is: 937.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.79 : 1,247.00 = 624.65 : x
  2. Step 2: Convert to fraction form
    830.79/1,247.00 = 624.65/x
  3. Step 3: Cross multiply
    830.79x = 1,247.00 × 624.65
  4. Step 4: Simplify right side
    830.79x = 778,929.19
  5. Step 5: Solve for x
    x = 778,929.19/830.79
  6. Step 6: Final answer
    x = 937.58

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Double scale
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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.