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Finding the Fourth Proportional to 389,991.40, 584,987.10 and 153,341.80

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Solution

The fourth proportional to 389,991.40, 584,987.10 and 153,341.80 is: 230,012.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,991.40 : 584,987.10 = 153,341.80 : x
  2. Step 2: Convert to fraction form
    389,991.40/584,987.10 = 153,341.80/x
  3. Step 3: Cross multiply
    389,991.40x = 584,987.10 × 153,341.80
  4. Step 4: Simplify right side
    389,991.40x = 89,702,974,890.78
  5. Step 5: Solve for x
    x = 89,702,974,890.78/389,991.40
  6. Step 6: Final answer
    x = 230,012.70

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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.