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Finding the Fourth Proportional to 521,420.95, 719,189.18 and 478,538.67

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Solution

The fourth proportional to 521,420.95, 719,189.18 and 478,538.67 is: 660,042.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    521,420.95 : 719,189.18 = 478,538.67 : x
  2. Step 2: Convert to fraction form
    521,420.95/719,189.18 = 478,538.67/x
  3. Step 3: Cross multiply
    521,420.95x = 719,189.18 × 478,538.67
  4. Step 4: Simplify right side
    521,420.95x = 344,159,831,282.90
  5. Step 5: Solve for x
    x = 344,159,831,282.90/521,420.95
  6. Step 6: Final answer
    x = 660,042.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.