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Finding the Fourth Proportional to 390,007.40, 538,460.34 and 318,558.92

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Solution

The fourth proportional to 390,007.40, 538,460.34 and 318,558.92 is: 439,815.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,007.40 : 538,460.34 = 318,558.92 : x
  2. Step 2: Convert to fraction form
    390,007.40/538,460.34 = 318,558.92/x
  3. Step 3: Cross multiply
    390,007.40x = 538,460.34 × 318,558.92
  4. Step 4: Simplify right side
    390,007.40x = 171,531,344,373.23
  5. Step 5: Solve for x
    x = 171,531,344,373.23/390,007.40
  6. Step 6: Final answer
    x = 439,815.61

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1.5x scale

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.