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Finding the Fourth Proportional to 287,880.88, 431,717.64 and 121,681.84

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Solution

The fourth proportional to 287,880.88, 431,717.64 and 121,681.84 is: 182,478.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,880.88 : 431,717.64 = 121,681.84 : x
  2. Step 2: Convert to fraction form
    287,880.88/431,717.64 = 121,681.84/x
  3. Step 3: Cross multiply
    287,880.88x = 431,717.64 × 121,681.84
  4. Step 4: Simplify right side
    287,880.88x = 52,532,196,795.66
  5. Step 5: Solve for x
    x = 52,532,196,795.66/287,880.88
  6. Step 6: Final answer
    x = 182,478.94

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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.