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Finding the Fourth Proportional to 978.75, 1,350.54 and 574.98

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Solution

The fourth proportional to 978.75, 1,350.54 and 574.98 is: 793.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.75 : 1,350.54 = 574.98 : x
  2. Step 2: Convert to fraction form
    978.75/1,350.54 = 574.98/x
  3. Step 3: Cross multiply
    978.75x = 1,350.54 × 574.98
  4. Step 4: Simplify right side
    978.75x = 776,533.49
  5. Step 5: Solve for x
    x = 776,533.49/978.75
  6. Step 6: Final answer
    x = 793.39

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.