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Finding the Fourth Proportional to 70,809.45, 97,717.74 and 38,979

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Solution

The fourth proportional to 70,809.45, 97,717.74 and 38,979 is: 53,791.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,809.45 : 97,717.74 = 38,979 : x
  2. Step 2: Convert to fraction form
    70,809.45/97,717.74 = 38,979/x
  3. Step 3: Cross multiply
    70,809.45x = 97,717.74 × 38,979
  4. Step 4: Simplify right side
    70,809.45x = 3,808,939,787.46
  5. Step 5: Solve for x
    x = 3,808,939,787.46/70,809.45
  6. Step 6: Final answer
    x = 53,791.40

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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.