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Finding the Fourth Proportional to 518,999.76, 716,103.50 and 390,248.37

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Solution

The fourth proportional to 518,999.76, 716,103.50 and 390,248.37 is: 538,455.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    518,999.76 : 716,103.50 = 390,248.37 : x
  2. Step 2: Convert to fraction form
    518,999.76/716,103.50 = 390,248.37/x
  3. Step 3: Cross multiply
    518,999.76x = 716,103.50 × 390,248.37
  4. Step 4: Simplify right side
    518,999.76x = 279,458,221,675.05
  5. Step 5: Solve for x
    x = 279,458,221,675.05/518,999.76
  6. Step 6: Final answer
    x = 538,455.40

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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.