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Finding the Fourth Proportional to 318,985.70, 478,462.64 and 119,291.40

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Solution

The fourth proportional to 318,985.70, 478,462.64 and 119,291.40 is: 178,931.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,985.70 : 478,462.64 = 119,291.40 : x
  2. Step 2: Convert to fraction form
    318,985.70/478,462.64 = 119,291.40/x
  3. Step 3: Cross multiply
    318,985.70x = 478,462.64 × 119,291.40
  4. Step 4: Simplify right side
    318,985.70x = 57,076,478,173.30
  5. Step 5: Solve for x
    x = 57,076,478,173.30/318,985.70
  6. Step 6: Final answer
    x = 178,931.15

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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.