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Finding the Fourth Proportional to 651.35, 978.08 and 618.46

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Solution

The fourth proportional to 651.35, 978.08 and 618.46 is: 928.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    651.35 : 978.08 = 618.46 : x
  2. Step 2: Convert to fraction form
    651.35/978.08 = 618.46/x
  3. Step 3: Cross multiply
    651.35x = 978.08 × 618.46
  4. Step 4: Simplify right side
    651.35x = 604,897.82
  5. Step 5: Solve for x
    x = 604,897.82/651.35
  6. Step 6: Final answer
    x = 928.68

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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.