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Finding the Fourth Proportional to 219,315.40, 302,657.80 and 128,672.92

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Solution

The fourth proportional to 219,315.40, 302,657.80 and 128,672.92 is: 177,570.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    219,315.40 : 302,657.80 = 128,672.92 : x
  2. Step 2: Convert to fraction form
    219,315.40/302,657.80 = 128,672.92/x
  3. Step 3: Cross multiply
    219,315.40x = 302,657.80 × 128,672.92
  4. Step 4: Simplify right side
    219,315.40x = 38,943,862,886.78
  5. Step 5: Solve for x
    x = 38,943,862,886.78/219,315.40
  6. Step 6: Final answer
    x = 177,570.12

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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.