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Finding the Fourth Proportional to 280,755.30, 387,442.54 and 153,430.93

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Solution

The fourth proportional to 280,755.30, 387,442.54 and 153,430.93 is: 211,734.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,755.30 : 387,442.54 = 153,430.93 : x
  2. Step 2: Convert to fraction form
    280,755.30/387,442.54 = 153,430.93/x
  3. Step 3: Cross multiply
    280,755.30x = 387,442.54 × 153,430.93
  4. Step 4: Simplify right side
    280,755.30x = 59,445,669,233.76
  5. Step 5: Solve for x
    x = 59,445,669,233.76/280,755.30
  6. Step 6: Final answer
    x = 211,734.81

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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.