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Finding the Fourth Proportional to 208,123.25, 287,210.79 and 112,629.92

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Solution

The fourth proportional to 208,123.25, 287,210.79 and 112,629.92 is: 155,429.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    208,123.25 : 287,210.79 = 112,629.92 : x
  2. Step 2: Convert to fraction form
    208,123.25/287,210.79 = 112,629.92/x
  3. Step 3: Cross multiply
    208,123.25x = 287,210.79 × 112,629.92
  4. Step 4: Simplify right side
    208,123.25x = 32,348,528,300.84
  5. Step 5: Solve for x
    x = 32,348,528,300.84/208,123.25
  6. Step 6: Final answer
    x = 155,429.67

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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.