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Finding the Fourth Proportional to 212,985.60, 319,478.40 and 81,657.60

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Solution

The fourth proportional to 212,985.60, 319,478.40 and 81,657.60 is: 122,486.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,985.60 : 319,478.40 = 81,657.60 : x
  2. Step 2: Convert to fraction form
    212,985.60/319,478.40 = 81,657.60/x
  3. Step 3: Cross multiply
    212,985.60x = 319,478.40 × 81,657.60
  4. Step 4: Simplify right side
    212,985.60x = 26,087,839,395.84
  5. Step 5: Solve for x
    x = 26,087,839,395.84/212,985.60
  6. Step 6: Final answer
    x = 122,486.40

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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.