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Finding the Fourth Proportional to 608,407.86, 839,715.16 and 390,888.45

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Solution

The fourth proportional to 608,407.86, 839,715.16 and 390,888.45 is: 539,498.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    608,407.86 : 839,715.16 = 390,888.45 : x
  2. Step 2: Convert to fraction form
    608,407.86/839,715.16 = 390,888.45/x
  3. Step 3: Cross multiply
    608,407.86x = 839,715.16 × 390,888.45
  4. Step 4: Simplify right side
    608,407.86x = 328,234,957,333.90
  5. Step 5: Solve for x
    x = 328,234,957,333.90/608,407.86
  6. Step 6: Final answer
    x = 539,498.22

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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.