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Finding the Fourth Proportional to 521,368.79, 719,117.90 and 478,486.78

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Solution

The fourth proportional to 521,368.79, 719,117.90 and 478,486.78 is: 659,971.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    521,368.79 : 719,117.90 = 478,486.78 : x
  2. Step 2: Convert to fraction form
    521,368.79/719,117.90 = 478,486.78/x
  3. Step 3: Cross multiply
    521,368.79x = 719,117.90 × 478,486.78
  4. Step 4: Simplify right side
    521,368.79x = 344,088,406,015.46
  5. Step 5: Solve for x
    x = 344,088,406,015.46/521,368.79
  6. Step 6: Final answer
    x = 659,971.24

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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.