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Finding the Fourth Proportional to 261,590, 392,388.70 and 74,601.50

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Solution

The fourth proportional to 261,590, 392,388.70 and 74,601.50 is: 111,903.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,590 : 392,388.70 = 74,601.50 : x
  2. Step 2: Convert to fraction form
    261,590/392,388.70 = 74,601.50/x
  3. Step 3: Cross multiply
    261,590x = 392,388.70 × 74,601.50
  4. Step 4: Simplify right side
    261,590x = 29,272,785,603.05
  5. Step 5: Solve for x
    x = 29,272,785,603.05/261,590
  6. Step 6: Final answer
    x = 111,903.31

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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.