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Finding the Fourth Proportional to 210,715.50, 290,787.39 and 121,291.50

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Solution

The fourth proportional to 210,715.50, 290,787.39 and 121,291.50 is: 167,382.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,715.50 : 290,787.39 = 121,291.50 : x
  2. Step 2: Convert to fraction form
    210,715.50/290,787.39 = 121,291.50/x
  3. Step 3: Cross multiply
    210,715.50x = 290,787.39 × 121,291.50
  4. Step 4: Simplify right side
    210,715.50x = 35,270,038,714.19
  5. Step 5: Solve for x
    x = 35,270,038,714.19/210,715.50
  6. Step 6: Final answer
    x = 167,382.27

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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.