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Finding the Fourth Proportional to 388,991.60, 583,444.20 and 318,748.40

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Solution

The fourth proportional to 388,991.60, 583,444.20 and 318,748.40 is: 478,087.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,991.60 : 583,444.20 = 318,748.40 : x
  2. Step 2: Convert to fraction form
    388,991.60/583,444.20 = 318,748.40/x
  3. Step 3: Cross multiply
    388,991.60x = 583,444.20 × 318,748.40
  4. Step 4: Simplify right side
    388,991.60x = 185,971,905,239.28
  5. Step 5: Solve for x
    x = 185,971,905,239.28/388,991.60
  6. Step 6: Final answer
    x = 478,087.20

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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.