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Finding the Fourth Proportional to 319,983.40, 478,808.70 and 291,989.80

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Solution

The fourth proportional to 319,983.40, 478,808.70 and 291,989.80 is: 436,920.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    319,983.40 : 478,808.70 = 291,989.80 : x
  2. Step 2: Convert to fraction form
    319,983.40/478,808.70 = 291,989.80/x
  3. Step 3: Cross multiply
    319,983.40x = 478,808.70 × 291,989.80
  4. Step 4: Simplify right side
    319,983.40x = 139,807,256,551.26
  5. Step 5: Solve for x
    x = 139,807,256,551.26/319,983.40
  6. Step 6: Final answer
    x = 436,920.34

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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.