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Finding the Fourth Proportional to 390,855.60, 586,283.40 and 141,716.40

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Solution

The fourth proportional to 390,855.60, 586,283.40 and 141,716.40 is: 212,574.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,855.60 : 586,283.40 = 141,716.40 : x
  2. Step 2: Convert to fraction form
    390,855.60/586,283.40 = 141,716.40/x
  3. Step 3: Cross multiply
    390,855.60x = 586,283.40 × 141,716.40
  4. Step 4: Simplify right side
    390,855.60x = 83,085,972,827.76
  5. Step 5: Solve for x
    x = 83,085,972,827.76/390,855.60
  6. Step 6: Final answer
    x = 212,574.60

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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.