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Finding the Fourth Proportional to 125,357.40, 172,980.54 and 70,915.50

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Solution

The fourth proportional to 125,357.40, 172,980.54 and 70,915.50 is: 97,856.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,357.40 : 172,980.54 = 70,915.50 : x
  2. Step 2: Convert to fraction form
    125,357.40/172,980.54 = 70,915.50/x
  3. Step 3: Cross multiply
    125,357.40x = 172,980.54 × 70,915.50
  4. Step 4: Simplify right side
    125,357.40x = 12,267,001,484.37
  5. Step 5: Solve for x
    x = 12,267,001,484.37/125,357.40
  6. Step 6: Final answer
    x = 97,856.22

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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.