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Finding the Fourth Proportional to 118,421.16, 178,328.75 and 85,373.77

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Solution

The fourth proportional to 118,421.16, 178,328.75 and 85,373.77 is: 128,563.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    118,421.16 : 178,328.75 = 85,373.77 : x
  2. Step 2: Convert to fraction form
    118,421.16/178,328.75 = 85,373.77/x
  3. Step 3: Cross multiply
    118,421.16x = 178,328.75 × 85,373.77
  4. Step 4: Simplify right side
    118,421.16x = 15,224,597,134.35
  5. Step 5: Solve for x
    x = 15,224,597,134.35/118,421.16
  6. Step 6: Final answer
    x = 128,563.15

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.