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Finding the Fourth Proportional to 478,643.80, 717,309.60 and 390,070.30

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Solution

The fourth proportional to 478,643.80, 717,309.60 and 390,070.30 is: 584,570.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    478,643.80 : 717,309.60 = 390,070.30 : x
  2. Step 2: Convert to fraction form
    478,643.80/717,309.60 = 390,070.30/x
  3. Step 3: Cross multiply
    478,643.80x = 717,309.60 × 390,070.30
  4. Step 4: Simplify right side
    478,643.80x = 279,801,170,864.88
  5. Step 5: Solve for x
    x = 279,801,170,864.88/478,643.80
  6. Step 6: Final answer
    x = 584,570.76

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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.