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Finding the Fourth Proportional to 343,390.20, 515,085.30 and 90,670.20

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Solution

The fourth proportional to 343,390.20, 515,085.30 and 90,670.20 is: 136,005.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    343,390.20 : 515,085.30 = 90,670.20 : x
  2. Step 2: Convert to fraction form
    343,390.20/515,085.30 = 90,670.20/x
  3. Step 3: Cross multiply
    343,390.20x = 515,085.30 × 90,670.20
  4. Step 4: Simplify right side
    343,390.20x = 46,702,887,168.06
  5. Step 5: Solve for x
    x = 46,702,887,168.06/343,390.20
  6. Step 6: Final answer
    x = 136,005.30

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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.