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Finding the Fourth Proportional to 318,547.40, 439,572.75 and 189,478.76

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Solution

The fourth proportional to 318,547.40, 439,572.75 and 189,478.76 is: 261,467.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,547.40 : 439,572.75 = 189,478.76 : x
  2. Step 2: Convert to fraction form
    318,547.40/439,572.75 = 189,478.76/x
  3. Step 3: Cross multiply
    318,547.40x = 439,572.75 × 189,478.76
  4. Step 4: Simplify right side
    318,547.40x = 83,289,697,401.93
  5. Step 5: Solve for x
    x = 83,289,697,401.93/318,547.40
  6. Step 6: Final answer
    x = 261,467.21

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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.