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Finding the Fourth Proportional to 879.99, 1,320.08 and 392.98

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Solution

The fourth proportional to 879.99, 1,320.08 and 392.98 is: 589.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.99 : 1,320.08 = 392.98 : x
  2. Step 2: Convert to fraction form
    879.99/1,320.08 = 392.98/x
  3. Step 3: Cross multiply
    879.99x = 1,320.08 × 392.98
  4. Step 4: Simplify right side
    879.99x = 518,762.72
  5. Step 5: Solve for x
    x = 518,762.72/879.99
  6. Step 6: Final answer
    x = 589.51

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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.