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Finding the Fourth Proportional to 518,871.80, 778,890.90 and 401,065.40

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Solution

The fourth proportional to 518,871.80, 778,890.90 and 401,065.40 is: 602,048.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    518,871.80 : 778,890.90 = 401,065.40 : x
  2. Step 2: Convert to fraction form
    518,871.80/778,890.90 = 401,065.40/x
  3. Step 3: Cross multiply
    518,871.80x = 778,890.90 × 401,065.40
  4. Step 4: Simplify right side
    518,871.80x = 312,386,190,364.86
  5. Step 5: Solve for x
    x = 312,386,190,364.86/518,871.80
  6. Step 6: Final answer
    x = 602,048.89

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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.