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Finding the Fourth Proportional to 191,079, 286,618.50 and 66,420

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Solution

The fourth proportional to 191,079, 286,618.50 and 66,420 is: 99,630

Step by Step Solution

  1. Step 1: Write the proportion equation
    191,079 : 286,618.50 = 66,420 : x
  2. Step 2: Convert to fraction form
    191,079/286,618.50 = 66,420/x
  3. Step 3: Cross multiply
    191,079x = 286,618.50 × 66,420
  4. Step 4: Simplify right side
    191,079x = 19,037,200,770
  5. Step 5: Solve for x
    x = 19,037,200,770/191,079
  6. Step 6: Final answer
    x = 99,630

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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.