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Finding the Fourth Proportional to 652.19, 978.10 and 339.50

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Solution

The fourth proportional to 652.19, 978.10 and 339.50 is: 509.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    652.19 : 978.10 = 339.50 : x
  2. Step 2: Convert to fraction form
    652.19/978.10 = 339.50/x
  3. Step 3: Cross multiply
    652.19x = 978.10 × 339.50
  4. Step 4: Simplify right side
    652.19x = 332,066.55
  5. Step 5: Solve for x
    x = 332,066.55/652.19
  6. Step 6: Final answer
    x = 509.16

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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.