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Finding the Fourth Proportional to 712,615.29, 983,409.52 and 390,330.77

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Solution

The fourth proportional to 712,615.29, 983,409.52 and 390,330.77 is: 538,656.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    712,615.29 : 983,409.52 = 390,330.77 : x
  2. Step 2: Convert to fraction form
    712,615.29/983,409.52 = 390,330.77/x
  3. Step 3: Cross multiply
    712,615.29x = 983,409.52 × 390,330.77
  4. Step 4: Simplify right side
    712,615.29x = 383,854,995,166.93
  5. Step 5: Solve for x
    x = 383,854,995,166.93/712,615.29
  6. Step 6: Final answer
    x = 538,656.69

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Double scale
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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.