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Finding the Fourth Proportional to 70,490, 97,287.72 and 40,699.28

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Solution

The fourth proportional to 70,490, 97,287.72 and 40,699.28 is: 56,171.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,490 : 97,287.72 = 40,699.28 : x
  2. Step 2: Convert to fraction form
    70,490/97,287.72 = 40,699.28/x
  3. Step 3: Cross multiply
    70,490x = 97,287.72 × 40,699.28
  4. Step 4: Simplify right side
    70,490x = 3,959,540,156.84
  5. Step 5: Solve for x
    x = 3,959,540,156.84/70,490
  6. Step 6: Final answer
    x = 56,171.66

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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.