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Finding the Fourth Proportional to 153,928.13, 212,420.82 and 86,860.13

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Solution

The fourth proportional to 153,928.13, 212,420.82 and 86,860.13 is: 119,866.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,928.13 : 212,420.82 = 86,860.13 : x
  2. Step 2: Convert to fraction form
    153,928.13/212,420.82 = 86,860.13/x
  3. Step 3: Cross multiply
    153,928.13x = 212,420.82 × 86,860.13
  4. Step 4: Simplify right side
    153,928.13x = 18,450,900,039.91
  5. Step 5: Solve for x
    x = 18,450,900,039.91/153,928.13
  6. Step 6: Final answer
    x = 119,866.98

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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.