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Finding the Fourth Proportional to 65,390.40, 90,266.22 and 55,370.79

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Solution

The fourth proportional to 65,390.40, 90,266.22 and 55,370.79 is: 76,434.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,390.40 : 90,266.22 = 55,370.79 : x
  2. Step 2: Convert to fraction form
    65,390.40/90,266.22 = 55,370.79/x
  3. Step 3: Cross multiply
    65,390.40x = 90,266.22 × 55,370.79
  4. Step 4: Simplify right side
    65,390.40x = 4,998,111,911.71
  5. Step 5: Solve for x
    x = 4,998,111,911.71/65,390.40
  6. Step 6: Final answer
    x = 76,434.95

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1.5x scale

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.