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Finding the Fourth Proportional to 390,973.58, 586,508.66 and 138,201.94

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Solution

The fourth proportional to 390,973.58, 586,508.66 and 138,201.94 is: 207,319.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,973.58 : 586,508.66 = 138,201.94 : x
  2. Step 2: Convert to fraction form
    390,973.58/586,508.66 = 138,201.94/x
  3. Step 3: Cross multiply
    390,973.58x = 586,508.66 × 138,201.94
  4. Step 4: Simplify right side
    390,973.58x = 81,056,634,638.80
  5. Step 5: Solve for x
    x = 81,056,634,638.80/390,973.58
  6. Step 6: Final answer
    x = 207,319.98

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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.