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Finding the Fourth Proportional to 256,120.65, 353,281.55 and 155,518.65

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Solution

The fourth proportional to 256,120.65, 353,281.55 and 155,518.65 is: 214,515.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,120.65 : 353,281.55 = 155,518.65 : x
  2. Step 2: Convert to fraction form
    256,120.65/353,281.55 = 155,518.65/x
  3. Step 3: Cross multiply
    256,120.65x = 353,281.55 × 155,518.65
  4. Step 4: Simplify right side
    256,120.65x = 54,941,868,948.31
  5. Step 5: Solve for x
    x = 54,941,868,948.31/256,120.65
  6. Step 6: Final answer
    x = 214,515.58

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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.