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Finding the Fourth Proportional to 285,422.90, 393,866.71 and 156,335.63

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Solution

The fourth proportional to 285,422.90, 393,866.71 and 156,335.63 is: 215,733.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    285,422.90 : 393,866.71 = 156,335.63 : x
  2. Step 2: Convert to fraction form
    285,422.90/393,866.71 = 156,335.63/x
  3. Step 3: Cross multiply
    285,422.90x = 393,866.71 × 156,335.63
  4. Step 4: Simplify right side
    285,422.90x = 61,575,400,837.71
  5. Step 5: Solve for x
    x = 61,575,400,837.71/285,422.90
  6. Step 6: Final answer
    x = 215,733.92

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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.