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Finding the Fourth Proportional to 319,983.90, 478,809.45 and 291,990.30

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Solution

The fourth proportional to 319,983.90, 478,809.45 and 291,990.30 is: 436,921.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    319,983.90 : 478,809.45 = 291,990.30 : x
  2. Step 2: Convert to fraction form
    319,983.90/478,809.45 = 291,990.30/x
  3. Step 3: Cross multiply
    319,983.90x = 478,809.45 × 291,990.30
  4. Step 4: Simplify right side
    319,983.90x = 139,807,714,948.34
  5. Step 5: Solve for x
    x = 139,807,714,948.34/319,983.90
  6. Step 6: Final answer
    x = 436,921.09

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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.