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Finding the Fourth Proportional to 719,307, 992,643.66 and 401,355

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Solution

The fourth proportional to 719,307, 992,643.66 and 401,355 is: 553,869.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    719,307 : 992,643.66 = 401,355 : x
  2. Step 2: Convert to fraction form
    719,307/992,643.66 = 401,355/x
  3. Step 3: Cross multiply
    719,307x = 992,643.66 × 401,355
  4. Step 4: Simplify right side
    719,307x = 398,402,496,159.30
  5. Step 5: Solve for x
    x = 398,402,496,159.30/719,307
  6. Step 6: Final answer
    x = 553,869.90

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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.