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Finding the Fourth Proportional to 170,978.04, 256,518.90 and 121,154.67

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Solution

The fourth proportional to 170,978.04, 256,518.90 and 121,154.67 is: 181,768.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    170,978.04 : 256,518.90 = 121,154.67 : x
  2. Step 2: Convert to fraction form
    170,978.04/256,518.90 = 121,154.67/x
  3. Step 3: Cross multiply
    170,978.04x = 256,518.90 × 121,154.67
  4. Step 4: Simplify right side
    170,978.04x = 31,078,462,678.26
  5. Step 5: Solve for x
    x = 31,078,462,678.26/170,978.04
  6. Step 6: Final answer
    x = 181,768.74

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.