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Finding the Fourth Proportional to 390,943.65, 539,224.07 and 358,782.15

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Solution

The fourth proportional to 390,943.65, 539,224.07 and 358,782.15 is: 494,864.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,943.65 : 539,224.07 = 358,782.15 : x
  2. Step 2: Convert to fraction form
    390,943.65/539,224.07 = 358,782.15/x
  3. Step 3: Cross multiply
    390,943.65x = 539,224.07 × 358,782.15
  4. Step 4: Simplify right side
    390,943.65x = 193,463,971,166.35
  5. Step 5: Solve for x
    x = 193,463,971,166.35/390,943.65
  6. Step 6: Final answer
    x = 494,864.08

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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.