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Finding the Fourth Proportional to 28,531,978.40, 42,797,967.60 and 18,960,240.80

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Solution

The fourth proportional to 28,531,978.40, 42,797,967.60 and 18,960,240.80 is: 28,440,361.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,531,978.40 : 42,797,967.60 = 18,960,240.80 : x
  2. Step 2: Convert to fraction form
    28,531,978.40/42,797,967.60 = 18,960,240.80/x
  3. Step 3: Cross multiply
    28,531,978.40x = 42,797,967.60 × 18,960,240.80
  4. Step 4: Simplify right side
    28,531,978.40x = 811,459,771,446,598.12
  5. Step 5: Solve for x
    x = 811,459,771,446,598.12/28,531,978.40
  6. Step 6: Final answer
    x = 28,440,361.20

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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.