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Finding the Fourth Proportional to 389,420.50, 537,400.32 and 210,572.50

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Solution

The fourth proportional to 389,420.50, 537,400.32 and 210,572.50 is: 290,590.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,420.50 : 537,400.32 = 210,572.50 : x
  2. Step 2: Convert to fraction form
    389,420.50/537,400.32 = 210,572.50/x
  3. Step 3: Cross multiply
    389,420.50x = 537,400.32 × 210,572.50
  4. Step 4: Simplify right side
    389,420.50x = 113,161,728,883.20
  5. Step 5: Solve for x
    x = 113,161,728,883.20/389,420.50
  6. Step 6: Final answer
    x = 290,590.07

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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.