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Finding the Fourth Proportional to 917.65, 1,374.90 and 429.70

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Solution

The fourth proportional to 917.65, 1,374.90 and 429.70 is: 643.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.65 : 1,374.90 = 429.70 : x
  2. Step 2: Convert to fraction form
    917.65/1,374.90 = 429.70/x
  3. Step 3: Cross multiply
    917.65x = 1,374.90 × 429.70
  4. Step 4: Simplify right side
    917.65x = 590,794.53
  5. Step 5: Solve for x
    x = 590,794.53/917.65
  6. Step 6: Final answer
    x = 643.81

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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.