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Finding the Fourth Proportional to 261,497.16, 391,901.16 and 103,639.56

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Solution

The fourth proportional to 261,497.16, 391,901.16 and 103,639.56 is: 155,322.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,497.16 : 391,901.16 = 103,639.56 : x
  2. Step 2: Convert to fraction form
    261,497.16/391,901.16 = 103,639.56/x
  3. Step 3: Cross multiply
    261,497.16x = 391,901.16 × 103,639.56
  4. Step 4: Simplify right side
    261,497.16x = 40,616,463,785.89
  5. Step 5: Solve for x
    x = 40,616,463,785.89/261,497.16
  6. Step 6: Final answer
    x = 155,322.77

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.