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Finding the Fourth Proportional to 986,978.40, 1,480,813.20 and 426,415.20

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Solution

The fourth proportional to 986,978.40, 1,480,813.20 and 426,415.20 is: 639,772.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    986,978.40 : 1,480,813.20 = 426,415.20 : x
  2. Step 2: Convert to fraction form
    986,978.40/1,480,813.20 = 426,415.20/x
  3. Step 3: Cross multiply
    986,978.40x = 1,480,813.20 × 426,415.20
  4. Step 4: Simplify right side
    986,978.40x = 631,441,256,840.64
  5. Step 5: Solve for x
    x = 631,441,256,840.64/986,978.40
  6. Step 6: Final answer
    x = 639,772.11

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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.