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Finding the Fourth Proportional to 1,392.37, 1,923.55 and 914.95

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Solution

The fourth proportional to 1,392.37, 1,923.55 and 914.95 is: 1,264.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392.37 : 1,923.55 = 914.95 : x
  2. Step 2: Convert to fraction form
    1,392.37/1,923.55 = 914.95/x
  3. Step 3: Cross multiply
    1,392.37x = 1,923.55 × 914.95
  4. Step 4: Simplify right side
    1,392.37x = 1,759,952.19
  5. Step 5: Solve for x
    x = 1,759,952.19/1,392.37
  6. Step 6: Final answer
    x = 1,264.00

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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.