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Finding the Fourth Proportional to 388,308.78, 535,741.02 and 218,510.10

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Solution

The fourth proportional to 388,308.78, 535,741.02 and 218,510.10 is: 301,473.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,308.78 : 535,741.02 = 218,510.10 : x
  2. Step 2: Convert to fraction form
    388,308.78/535,741.02 = 218,510.10/x
  3. Step 3: Cross multiply
    388,308.78x = 535,741.02 × 218,510.10
  4. Step 4: Simplify right side
    388,308.78x = 117,064,823,854.30
  5. Step 5: Solve for x
    x = 117,064,823,854.30/388,308.78
  6. Step 6: Final answer
    x = 301,473.54

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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.