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Finding the Fourth Proportional to 389,421.80, 583,148.55 and 310,689.80

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Solution

The fourth proportional to 389,421.80, 583,148.55 and 310,689.80 is: 465,249.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,421.80 : 583,148.55 = 310,689.80 : x
  2. Step 2: Convert to fraction form
    389,421.80/583,148.55 = 310,689.80/x
  3. Step 3: Cross multiply
    389,421.80x = 583,148.55 × 310,689.80
  4. Step 4: Simplify right side
    389,421.80x = 181,178,306,369.79
  5. Step 5: Solve for x
    x = 181,178,306,369.79/389,421.80
  6. Step 6: Final answer
    x = 465,249.52

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1.5x scale

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.