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Finding the Fourth Proportional to 265,390.88, 398,153.75 and 78,402.38

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Solution

The fourth proportional to 265,390.88, 398,153.75 and 78,402.38 is: 117,623.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    265,390.88 : 398,153.75 = 78,402.38 : x
  2. Step 2: Convert to fraction form
    265,390.88/398,153.75 = 78,402.38/x
  3. Step 3: Cross multiply
    265,390.88x = 398,153.75 × 78,402.38
  4. Step 4: Simplify right side
    265,390.88x = 31,216,201,605.93
  5. Step 5: Solve for x
    x = 31,216,201,605.93/265,390.88
  6. Step 6: Final answer
    x = 117,623.49

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1.5x scale

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.