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Finding the Fourth Proportional to 257,368.81, 355,178.07 and 155,374.35

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Solution

The fourth proportional to 257,368.81, 355,178.07 and 155,374.35 is: 214,422.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    257,368.81 : 355,178.07 = 155,374.35 : x
  2. Step 2: Convert to fraction form
    257,368.81/355,178.07 = 155,374.35/x
  3. Step 3: Cross multiply
    257,368.81x = 355,178.07 × 155,374.35
  4. Step 4: Simplify right side
    257,368.81x = 55,185,560,604.20
  5. Step 5: Solve for x
    x = 55,185,560,604.20/257,368.81
  6. Step 6: Final answer
    x = 214,422.10

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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.