Home / 208,123.19-287,015.09-138,148.74

Finding the Fourth Proportional to 208,123.19, 287,015.09 and 138,148.74

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Solution

The fourth proportional to 208,123.19, 287,015.09 and 138,148.74 is: 190,515.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    208,123.19 : 287,015.09 = 138,148.74 : x
  2. Step 2: Convert to fraction form
    208,123.19/287,015.09 = 138,148.74/x
  3. Step 3: Cross multiply
    208,123.19x = 287,015.09 × 138,148.74
  4. Step 4: Simplify right side
    208,123.19x = 39,650,772,353.74
  5. Step 5: Solve for x
    x = 39,650,772,353.74/208,123.19
  6. Step 6: Final answer
    x = 190,515.88

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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.