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Finding the Fourth Proportional to 614,741.70, 921,128.40 and 389,699.40

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Solution

The fourth proportional to 614,741.70, 921,128.40 and 389,699.40 is: 583,925.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    614,741.70 : 921,128.40 = 389,699.40 : x
  2. Step 2: Convert to fraction form
    614,741.70/921,128.40 = 389,699.40/x
  3. Step 3: Cross multiply
    614,741.70x = 921,128.40 × 389,699.40
  4. Step 4: Simplify right side
    614,741.70x = 358,963,184,802.96
  5. Step 5: Solve for x
    x = 358,963,184,802.96/614,741.70
  6. Step 6: Final answer
    x = 583,925.22

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.