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Finding the Fourth Proportional to 283,043.40, 390,585.78 and 155,715.72

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Solution

The fourth proportional to 283,043.40, 390,585.78 and 155,715.72 is: 214,879.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    283,043.40 : 390,585.78 = 155,715.72 : x
  2. Step 2: Convert to fraction form
    283,043.40/390,585.78 = 155,715.72/x
  3. Step 3: Cross multiply
    283,043.40x = 390,585.78 × 155,715.72
  4. Step 4: Simplify right side
    283,043.40x = 60,820,345,954.46
  5. Step 5: Solve for x
    x = 60,820,345,954.46/283,043.40
  6. Step 6: Final answer
    x = 214,879.93

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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.