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Finding the Fourth Proportional to 153,385.71, 211,670.58 and 85,401.21

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Solution

The fourth proportional to 153,385.71, 211,670.58 and 85,401.21 is: 117,852.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,385.71 : 211,670.58 = 85,401.21 : x
  2. Step 2: Convert to fraction form
    153,385.71/211,670.58 = 85,401.21/x
  3. Step 3: Cross multiply
    153,385.71x = 211,670.58 × 85,401.21
  4. Step 4: Simplify right side
    153,385.71x = 18,076,923,653.40
  5. Step 5: Solve for x
    x = 18,076,923,653.40/153,385.71
  6. Step 6: Final answer
    x = 117,852.72

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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.