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Finding the Fourth Proportional to 77,615.39, 107,090.25 and 47,389.70

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Solution

The fourth proportional to 77,615.39, 107,090.25 and 47,389.70 is: 65,386.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,615.39 : 107,090.25 = 47,389.70 : x
  2. Step 2: Convert to fraction form
    77,615.39/107,090.25 = 47,389.70/x
  3. Step 3: Cross multiply
    77,615.39x = 107,090.25 × 47,389.70
  4. Step 4: Simplify right side
    77,615.39x = 5,074,974,820.43
  5. Step 5: Solve for x
    x = 5,074,974,820.43/77,615.39
  6. Step 6: Final answer
    x = 65,386.19

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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.