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Finding the Fourth Proportional to 319,615.40, 478,985.70 and 212,695.40

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Solution

The fourth proportional to 319,615.40, 478,985.70 and 212,695.40 is: 318,752.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    319,615.40 : 478,985.70 = 212,695.40 : x
  2. Step 2: Convert to fraction form
    319,615.40/478,985.70 = 212,695.40/x
  3. Step 3: Cross multiply
    319,615.40x = 478,985.70 × 212,695.40
  4. Step 4: Simplify right side
    319,615.40x = 101,878,055,055.78
  5. Step 5: Solve for x
    x = 101,878,055,055.78/319,615.40
  6. Step 6: Final answer
    x = 318,752.02

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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.