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Finding the Fourth Proportional to 978.47, 1,467.40 and 430.50

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Solution

The fourth proportional to 978.47, 1,467.40 and 430.50 is: 645.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.47 : 1,467.40 = 430.50 : x
  2. Step 2: Convert to fraction form
    978.47/1,467.40 = 430.50/x
  3. Step 3: Cross multiply
    978.47x = 1,467.40 × 430.50
  4. Step 4: Simplify right side
    978.47x = 631,715.70
  5. Step 5: Solve for x
    x = 631,715.70/978.47
  6. Step 6: Final answer
    x = 645.62

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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.